Fix/dynamic search hierarchy maps (#1591)

* Fix community hierarchy maps creation

* Semver

Author: AlonsoGuevara

.semversioner/next-release/patch-20250107232217157858.json

@@ -0,0 +1,4 @@
+{
+  "type": "patch",
+  "description": "Fix a bug on creating community hierarchy for dynamic search"
+}

graphrag/query/context_builder/dynamic_community_selection.py

@@ -58,19 +58,22 @@ def __init__(
         self.reports = {report.community_id: report for report in community_reports}
         # mapping from community to sub communities
         self.node2children = {
-            community.id: (
+            community.short_id: (
                 []
                 if community.sub_community_ids is None
-                else community.sub_community_ids
+                else [str(x) for x in community.sub_community_ids]
             )
             for community in communities
+            if community.short_id is not None
         }
+
         # mapping from community to parent community
         self.node2parent: dict[str, str] = {
             sub_community: community
             for community, sub_communities in self.node2children.items()
             for sub_community in sub_communities
         }
+
         # mapping from level to communities
         self.levels: dict[str, list[str]] = {}
 
@@ -182,5 +185,6 @@ async def select(self, query: str) -> tuple[list[CommunityReport], dict[str, Any
             llm_info["prompt_tokens"],
             llm_info["output_tokens"],
         )
+
         llm_info["ratings"] = ratings
         return community_reports, llm_info